I don't think a person would get banned on a forum except there's proof that he/she ripped the art, at least thats what I know...though I may be wrong.
I'll now point out the wrongs here;
well you filled the base color well...more or less, so its ok, however, the first and most important thing in digital painting is deciding where the light comes from, however, I can't quite figure out where your light comes from, and what they tell ya in art school is the area closest to the light is brightest, and vice versa(never went to art school though

) put it simply, there is no shade without light, so I assume you didn't shade this lineart/you shaded it poorly, and what angers me the most is that lens flare, its completely inappropriate, don't use lens flare as light source EVER.
-Try searching for tutorial on lighting and such(deviantart has so many, and much more artists willing to help)
-learn how to paint(if you can afford a tablet great!)
-learn how to use tools like; smudge/blur/sharpen, burn/dodge, and so on
-I'd recommend HSB sliders when painting(I use it?O_O(hue saturation brightness))
Remember that every critique is to make you better, and its nothing personal, I just want you to get better, and sorry if I went a little over the top there